Grinding machine



y- 1950 R. KEY ZER-ANDRE 2,514,245

GRINDING MACHINE Filed March 18, 1947 INVENTOR. ,g 1" RENE KEYZER-ANDRE M 11 1\ H Patented July 1950 UNITED STATES PATENT OFFICE 2,514,245 I GRINDING Re'n Keyzer-Andr, Miarni,Fla.

, "Application 'March'18, 1947, seriaiNofivasls'vi This invention relates to grinding and polishing, and more particularly to machines used in the production of lenses in which the machine must be initially set or adjusted in accordance with the specifications of the lens desired in order to accomplish the desired grinding operation.

Lens specifications are customarily given in terms of diopters, and heretofore in order to properly set a machine to reproduce a given lens it has been necessary to convert the specifications as given in diopters to degrees and minutes. To accomplish this operation various machines have been provided with conversion dials or scales, but in many instances these dials or scales were of insumcient scope to permit the conversion of relatively large diopter measurements. In such cases it was necessary to refer to supplementary charts in order to accomplish the desired conversion.

Illustrative of the prior art is the patent to Goddu 2,286,361 granted June'16, 1942, which is an example of a machine that may be used with applicants improvement.

In order to properly operate the prior art machines it was necessary to employ highly skilled labor capable of making the necessary conversions, and of setting up the machines, and added disadvantage arose from the fact that it was impossible for a shop foreman or other supervisor to directly check the grinding operations since the machines were set-up in terms of degrees and minutes while the specifications for the particular lens being ground were in terms of diopters. In order to make a check it was therefore necessary for the foreman or supervisor to reconvert from the degrees and minutes settingof the machines to diopters, in order to make a comparison of the setting with that called for by the original specification of the lens.

Among the objects of the invention is to simplify the above operation and to provide a machine employing a single gage reading in diopters by means of which an operator could quickly and accurately set a machine, and a supervisor by merely glancing at the machine in operation could immediately understand exactly what diopter reading was being followed in the grinding operation.

An object of the invention, therefore, is to provide a lens grinding machine with a single scale or gage graduated in diopters which, when set or adjusted in accordance with the lens specification, will result in the production of the correct lens.

A further object of this invention is to provide a lens grinding machine of simplified construc- -1 Claim. (Cl. '51165) tion having "a minimum number of parts, and a machine capable of being efficiently operated by an unskilled Workman.

Further objects and advantages of the invention will be apparent from the following description taken in conjunction with the accompanyingdrawings, wherein:

Fig. l is a fragmentary front elevation illustrating one application of the present invention;

Fig. 2, a side elevation on a reduced scale;

Fig. 3, a rear elevation; and

Fig. 4, a fragmentary detail.

With continued reference to the drawings, a grinding machine having a base I0, an upstanding body portion I I, houses grinding mechanism not shown.

The grinding machine includes a pivotally mounted machine head I2 and a crank wheel I3 having a handle I I, for moving or adjusting the head I2 to its proper working angle or position. A thickness indicator I5, also is operated by the turning member I6.

Gages, dials and charts which ordinarily have been a part of this machine have been eliminated and a backing plate or panel I'I, substituted. The backin plate has on its front face, the desired indicia including a scale I8, graduated in diopters from 16 to 15. This diopter scale could be stamped, printed, painted or engraved or otherwise applied to said surface and a light I 9 preferably of the fluorescent type, attached thereon, at the uppermost part of said backing plate I1, and so disposed, that the rays of light will illuminate the scale I8.

The head I2, is provided with a pointer or indicator 20 on its top surface, and is so disposed at the rearward end of said top surface, is adjacent the scale I8, on the backing plate II. Said indicator 2!] is cut partially along its center line, as indicated at 2!, with such cut forming the direct reading line. The indicator 20 may be secured to the head I2 by bolts 22 and 23, as shown in Fig. 4, or by rivets or the like.

The backing plate I1, is provided with a cut-out portion forming an opening 24 to facilitate easy access to the mechanical parts in the upright body portion I I, of the machine.

In the operation of the machine, the lens to be ground is clamped in the proper position in the machine, the crankwheel is revolved b the handle I4 until the hairline 2| on the indicator 20 is in direct line with the desired reading in diopters on the scale I8. The head I2 is then looked in position, and the grinding or surfacing operation is accomplished.

It will be obvious to those skilled in the art that various changes may be made in the invention without departing from the spirit and scope thereof and therefore the invention is not limited by that which is shown in the drawing and described in the specification but only as indicated in the appended claim.

What is claimed is:

In a lens grinder comprising a frame, grinding mechanism including a pivotally mounted rotary grinding head supported on said frame, a rotary lens holder mounted on said frame below said grinding head, mechanism constructed and arranged to control the pivotal movementof said head, a panel mounted on said frame immediately behind said head and extending substantially above said head, a pointer rigidly mounted on the upper rear surface of said head and extending radially therefrom with respect to the pivotal axis of said head, a scale consisting of non-uni- .-formly spaced marks arranged in a circular are 20 '4 and numerals adjacent said marks corresponding to the diopter power of the various lenses which may be ground by the head, the upper extremity of said pointer being disposed in close association with said scale whereby pivotal adjustment of the head by the control mechanism to various positions will be accompanied by an indication by said pointer of the diopter power of the lens which may be ground by the head in that position.

' RENE KEYZER-ANDRE.

REFERENCES CITED The following references are of record in the file of this patent:

Goddu June 16, 1942 

